Trying to shut the yosh up a bit (pics inside)

Started by jhondius, Nov 13 2008 01:05 PM
30 replies to this topic

  • jhondius

Posted 13 November 2008 - 01:05 PM

#1


I hate stuffing the TRC, but sometime it's just too friggin loud!

So i made a dawg-inspired insert, hoping that would quiet it down without
restricting it too much.

And the results?
Not so good.

Performance seems to be way better then the potato.
The Thumping is gone and it leaves a higher pitched 2 strokey sound.
Quite annoying really, and still loud, maybe less db's.
At this stage i wont even bother to dyno or db measure it, because i dislike the way it sounds.

Ill be trying a bigger diam. hole and mesh to try and get something usefull out of it. Keeping you posted.

Aluminum tophat
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Cut it open
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Looks less restrictive than the potato doesnt it?
Posted Image

Fits in there nicely
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  • Dirtymutt9

Posted 13 November 2008 - 01:17 PM

#2

clean! what did u use to make it?

  • jhondius

Posted 13 November 2008 - 01:21 PM

#3

aluminum

  • rallyDRZ

Posted 13 November 2008 - 01:22 PM

#4

jhondius said:

aluminum

:lol:

  • akis

Posted 13 November 2008 - 01:24 PM

#5

Aha... a home made dB Dawg
Good work there.

Posted Image

We use them at our track (one of the rules) and they work well.

  • jhondius

Posted 13 November 2008 - 01:28 PM

#6

@akis: do they sound so high-pitched too?

..milled then handcut the sides off..

  • ebrabaek

Posted 13 November 2008 - 01:33 PM

#7

Nice work..... That is a small whole for the gasses to exit.....so there goes the performance. Perhaps make that whole as big as you can....put in a pipe say 8-10 inches long inserted into the muffler through the hole. The moment you restrict the flow....you restrict the power.:thumbsup: :thumbsup:

Erling

  • akis

Posted 13 November 2008 - 02:18 PM

#8

jhondius said:

@akis: do they sound so high-pitched too?
Not on any of our bikes that I've heard, no - all still sound deep and meaty.

  • f2dog

Posted 13 November 2008 - 02:27 PM

#9

Is there anyone who has taken a bike with the db dawg on the dyno ?
Seen post about it reducing sound by up to 10db,without loss of power ,but really would like to see a dyno

  • Eddie Sisneros

Posted 13 November 2008 - 02:30 PM

#10

false.

doesnt matter how you go about it,anyhing that combats noise by restricting the ex out let WILL affect the power out put.

  • GOF1

Posted 13 November 2008 - 02:38 PM

#11

Lets put it like this. Try breathing through a straw. Now do it while jogging.

  • ebrabaek

Posted 13 November 2008 - 02:41 PM

#12

GOF1 said:

Lets put it like this. Try breathing through a straw. Now do it while jogging.


Now that`s funny..:lol: :lol: And very right..:thumbsup: :thumbsup:

Erling

  • kjpiel

Posted 13 November 2008 - 06:23 PM

#13

They use to sell a glass pack or cherry bomb muffler for cars. It was straight threw and no restriction. I had one on my hot rod and liked it. Maybe you can adapt something like that

  • Roadracer Al

Posted 13 November 2008 - 06:46 PM

#14

You might be able to get rid of the "tweety" two-strokey sound by putting a 15* taper on the outlet, with the large end out. Also, I'd suggest milling the interior parts of the cavity flat, or if possible, with a 45* bevel.

I suspect you're getting a lot of turbulence at the exit, which is causing the high pitch.

  • brian0128

Posted 13 November 2008 - 08:31 PM

#15

Isn't there a tec insert to quiet down the Yosh Ti?

  • ebrabaek

Posted 13 November 2008 - 08:35 PM

#16

brian0128 said:

Isn't there a tec insert to quiet down the Yosh Ti?

Yes...that is the one the op. had next to his own.

Erling

  • ROMAD

Posted 13 November 2008 - 09:26 PM

#17

Looks like it will work with the Yoshi pipe... Foots Mod worked very nicely for me with my White Bros. R4 pipe and only took a small amount of work to get the fit right...just a little dremel grinding.

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  • jhondius

Posted 14 November 2008 - 08:27 AM

#18

Thanks for the helpfull suggestions!

Did anyone try the Foots Mod aka raptor insert on a dyno?
Will keep u posted on any further experimentation.

im afraid eddie's right: anything in there will slow it down,
but hey! i can try cant i?

  • akis

Posted 14 November 2008 - 08:58 AM

#19

f2dog said:

Is there anyone who has taken a bike with the db dawg on the dyno ?
Seen post about it reducing sound by up to 10db,without loss of power ,but really would like to see a dyno


Posted Image

  • f2dog

Posted 14 November 2008 - 09:06 AM

#20

Nice:thumbsup:



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